<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>1.htm</title>
</head>

<frameset rows="20%,70%,10%">
    <frame src="1.html">
    <frameset cols="30%,70%">
        <frame src="2.html">
        <frame name="main" src="3.html">
    </frameset>
    <frame src="6.html">
</frameset>

</html>